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Funding statement
We gratefully acknowledge funding by the US National
Science Foundation (Awards: 0107093 and 0001074) and U.S. Geological Survey for this
research (Awards: GRANT00017981, GRANT00018360, 04HQGR0063, 03HQGR0008,
03HQGR0006, 02HQGR0034, 02HQGR0043) and the Ministerio de Educación y Ciencia
(Award CGL2006-27096-E/BTE) and Consejo Superior de Investigaciones Científicas (CSIC)-
Spain (Award: PI 2006 3 01 021).
Remove constraint Funding statement: We gratefully acknowledge funding by the US National
Science Foundation (Awards: 0107093 and 0001074) and U.S. Geological Survey for this
research (Awards: GRANT00017981, GRANT00018360, 04HQGR0063, 03HQGR0008,
03HQGR0006, 02HQGR0034, 02HQGR0043) and the Ministerio de Educación y Ciencia
(Award CGL2006-27096-E/BTE) and Consejo Superior de Investigaciones Científicas (CSIC)-
Spain (Award: PI 2006 3 01 021).